ISL6844 INTERSIL [Intersil Corporation], ISL6844 Datasheet
ISL6844
Available stocks
Related parts for ISL6844
ISL6844 Summary of contents
Page 1
... Data Sheet Improved Industry Standard Single Ended Current Mode PWM Controller The ISL6842, ISL6843, ISL6844, ISL6845 family of adjustable frequency, low power, pulse width modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent over-current protection ...
Page 2
... COMPARATOR GND A 2.5 V A=0.5 CS ERROR AMPLIFIER + - FB COMP VREF 2.6V 0.7V ON OSCILLATOR COMPARATOR - RTCT + CLOCK 8.4mA ON V REF 5.00 V ENABLE VREF FAULT UV COMPARATOR 4.65V PWM COMPARATOR + - 100mV 2R 1.1V ISL6844/5 ONLY CLAMP RESET DOMINANT P/N UVLO ON/OFF 14.3 / 8.8V -42, -44 -43, -45 8.4 / 7.2V VREF - + V REF 4.80V BG OUT ...
Page 3
Typical Application - 48V Input Dual Output Flyback VIN+ R1 36-75V C1 VIN VR1 CR2 C5 CR6 R22 R27 U4 R26 COMP VREF CS FB RTCT ISL684x R10 CR1 C8 CR5 C21 ...
Page 4
... CURRENT SENSE Input Bias Current CS Offset Voltage COMP to PWM Comparator Offset Voltage Input Signal, Maximum 4 ISL6842, ISL6843, ISL6844, ISL6845 Thermal Information Thermal Resistance (Typical, Note 1) + 0.3V SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DD MSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 5
... Does not include gate drive current Guaranteed by design, not 100% tested in production. 6. Adjust V above the start threshold and then lower to 15V ISL6842, ISL6843, ISL6844, ISL6845 = 15V (Note 6 10kΩ 3.3nF (Continued) TEST CONDITIONS 0 < V < ...
Page 6
... • Figure 4 may be used as a guideline in selecting the capacitor and resistor values required for a given frequency. 6 ISL6842, ISL6843, ISL6844, ISL6845 80 110 o C) FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE 110 o C) COMP - COMP is the output of the error amplifier and the input of the PWM comparator ...
Page 7
... COMP GND FIGURE 5. SOFT START Gate Drive The ISL6842, ISL6843, ISL6844, ISL6845 are capable of sourcing and sinking 1A peak current. To limit the peak current through the IC, an optional external resistor may be placed between the totem-pole output of the IC (OUT pin) and the gate of the MOSFET. This small series resistor also ...
Page 8
... The lead width “B”, as measured 0.36mm (0.014 inch) or greater above the seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 10. Controlling dimension: MILLIMETER. Converted inch dimensions are not necessarily exact. 8 ISL6842, ISL6843, ISL6844, ISL6845 M8.15 8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE M B ...
Page 9
... However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 9 ISL6842, ISL6843, ISL6844, ISL6845 M8.118 (JEDEC MO-187AA) 8 LEAD MINI SMALL OUTLINE PLASTIC PACKAGE SYMBOL ...